Car keeps rolling when in gear

DULLAHAN2 · 23-03-2017 11:06AM #1

Hey so about 3 weeks ago i noticed that the handbrake in the car 05 Toyota Corolla was very loose but it still kept the car stationary. Today however when at the petrol pumps which is on a slant the car wouldn't stay stationary even when it was in gear.

How big a problem is this to fix?

Atlantic Dawn · 23-03-2017 12:19PM

I'd say handbrake just needs to be tightened, small fix.

mickdw · 23-03-2017 12:20PM

What gear did you park it in?

DULLAHAN2 · 23-03-2017 02:16PM

mickdw wrote: »

What gear did you park it in?

First

biko · 23-03-2017 02:16PM

There are two issues here yeah?

1 Car moves when handbrake is on
As said, probably just a slack cable.

2 Car moves when in gear
This is more serious if the gears don't engage. Can you even drive car?

Jack the Stripper · 23-03-2017 02:19PM

No manual car in the world is designed to hold itself stationary in gear.

23-03-2017 02:19PM

biko wrote: »

............ Can you even drive car?

I think it's obvious he can drive the car

OP, how much did it move when in gear?

DULLAHAN2 · 23-03-2017 02:23PM

Augeo wrote: »

I think it's obvious he can drive the car

OP, how much did it move when in gear?

It slowly keeps moving when parked at the petrol pumps which is on a slight slant

mickdw · 23-03-2017 02:51PM

Put it in reverse if facing down the slope

emeldc · 23-03-2017 02:58PM

DULLAHAN2 wrote: »

It slowly keeps moving when parked at the petrol pumps which is on a slight slant

That doesn't make sense TBH. It might roll if you were in 3rd or 5th but not 1st on just a slight slant.

Jack the Stripper wrote: »

No manual car in the world is designed to hold itself stationary in gear.

Maybe not, but any car I've ever had could hold itself in 1st or reverse. I never tried it on the side of a mountain though.

DULLAHAN2 · 23-03-2017 03:16PM

emeldc wrote: »

That doesn't make sense TBH. It might roll if you were in 3rd or 5th but not 1st on just a slight slant.
.

Yeah ill bring it to the mechanic's and see whats up

biko · 23-03-2017 03:22PM

If car just rolls an inch or two and then stops it's normal.
It's just gears settling.

If car, when in first, could actually roll away then there is a serious issue, as this mean gears are not engaging properly.

CiniO · 23-03-2017 04:37PM

biko wrote: »

If car just rolls an inch or two and then stops it's normal.
It's just gears settling.

If car, when in first, could actually roll away then there is a serious issue, as this mean gears are not engaging properly.

If gears were not engaging properly, then car would be hardly driveable.

Could it not be issue with an engine not having enough compression (f.e. damaged valves)?
Or incredibly small engine for the weight of the car?

Jack the Stripper · 23-03-2017 04:37PM

Biko you are incorrect on what you say above.

It's a corolla it's a low compression engine, think about it.

CiniO · 23-03-2017 04:38PM

Jack the Stripper wrote: »

No manual car in the world is designed to hold itself stationary in gear.

They all do.
I nearly always leave cars in gear, and only engage handbrake when necessary - f.e. parked on slope, or expecting wind.

Normally having it in gear is enough.

BlinkingLights · 23-03-2017 04:38PM

This is why cars have parking brakes (handbrakes)

If your car rolls because you failed to apply the handbrake and damages property or injures someone, you could easily be sued for negligence.

emeldc · 23-03-2017 04:53PM

Jack the Stripper wrote: »

Biko you are incorrect on what you say above.

It's a corolla it's a low compression engine, think about it.

So how will the engine generate enough compression to get moving with the engine running.

biko · 23-03-2017 05:11PM

Can't wait to hear back from OP on what the conclusion is.

selectamatic · 23-03-2017 05:24PM

Jack the Stripper wrote: »

Biko you are incorrect on what you say above.

It's a corolla it's a low compression engine, think about it.

It's not a "low compression engine" a 4zzfe corolla has a compression ratio of around 10.5:1

A 1.4L or 1400cc engine in an e12 corolla is also plenty big enough to hold the weight of the car while parked in gear.

fancy pigeon · 23-03-2017 05:25PM

selectamatic wrote: »

It's not a "low compression engine" a 4zzfe corolla has a compression ratio of around 10.5:1

A 1.4L or 1400cc engine in an e12 corolla is also plenty big enough to hold the weight of the car while parked in fear.

The fear of rolling away is strong in this case...

selectamatic · 23-03-2017 05:28PM

fancy pigeon wrote: »

The fear of rolling away is strong in this case...

What was that old saying?

The early pigeon catches the worm :P

Pete67 · 23-03-2017 05:48PM

Most manual transmissions cannot be depended on to hold a car stationary on a slope for any length of time as the slope applies a torque to the engine via the gearbox. This torque will turn the engine slowly until compression in one cylinder temporarily stops it. Over time very slight leakage past the rings or valve seats will result in the cylinder pressure dropping until the car lurchs forward slightly until the next cylinder starts a compression cycle, and the process repeats.
Not true with auto boxes in Park, which positively lock the transmission so that it cannot rotate. With a manual gearbox you should always apply the handbrake when parked.

colm_mcm · 23-03-2017 06:14PM

Jack the Stripper wrote: »

Biko you are incorrect on what you say above.

It's a corolla it's a low compression engine, think about it.

Do you claim to be a mechanic?

Jack the Stripper · 23-03-2017 06:21PM

colm_mcm wrote: »

Do you claim to be a mechanic?

I don't claim anything, they are your words, do you?

Cee-Jay-Cee · 23-03-2017 06:53PM

There is something amiss if the car rolls forward on a gentle slope while in 1st gear. I'd imagine the clutch is very worn but then that would be noticeable when driving because if there is enough wear to allow slippage when in 1st gear then there would be virtually no drive at all in higher gears. Strange one but I suspect that the OP isn't describing the problem accurately, ie, every car will roll a few inches until the gears engage and stop it so maybe he/she feels the car move slightly and applies the hand brake more or foot barke thinking its not holding at all whereas the car would stop itself within a few inches if they just left it.

colm_mcm · 23-03-2017 07:46PM

Jack the Stripper wrote: »

I don't claim anything, they are your words, do you?

I'm not a mechanic and don't claim to be. For some reason I thought you were a mechanic based on some previous posts.

And you?

bear1 · 23-03-2017 08:24PM

Jack the Stripper wrote: »

Biko you are incorrect on what you say above.

It's a corolla it's a low compression engine, think about it.

What's there to think about? All cars will move forward slightly when in gear and parked.
Engine compression has **** all to do with that.

Jack the Stripper · 23-03-2017 08:48PM

bear1 wrote: »

What's there to think about? All cars will move forward slightly when in gear and parked.
Engine compression has **** all to do with that.

Here is an experiment to try, petrol car remove spark plugs. Put in gear on hill/slope and have your phone on record.

bear1 · 23-03-2017 08:49PM

Jack the Stripper wrote: »

Here is an experiment to try, petrol car remove spark plugs. Put in gear on hill/slope and have your phone on record.

Why would you do that?
And if it's a diesel car? Do i remove the engine and see happens then?

Isambard · 23-03-2017 08:52PM

i thought you shouldn't leave a diesel in gear or is that ancient history?

Jack the Stripper · 23-03-2017 08:53PM

bear1 wrote: »

Why would you do that?
And if it's a diesel car? Do i remove the engine and see happens then?

You are saying compression has nothing to do with it, stick by your post now. If it's a diesel remove the glow plugs and injectors.

Car keeps rolling when in gear

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